However, humidity ranging from 9 20 may also cause a myriad of issues such as insects, fungi, and even seed sweating due to excessive heat. Two thousand seeds were buried within a 3 sq ft frame to allow recovery during the course of the experiment. It can survive many years in the soil, sometimes making eradication difficult.  Source: <a href=https://www.bigoven.com/recipe/seeds-may-cocktail/3078154>https://www.bigoven.com/recipe/seeds-may-cocktail/3078154</a>